I voted 9.
Let me put into context my experience.
Owned the original 1984 CD, purchased the Rhino Stereo Box Set 6/7/2023. Rhino Atmos 9/6/2024.
My surround review based on a few things.
My Atmos listen Blu Ray rip. Atmos MKV file, 24bit/48Khz. Single file entire DR 16. Chapters (tracks) DR 9, 10, 11's, 12's, 13's.
I also ripped the core, only available by ripping, 5.1 Dolby Digital 24bit, 48Khz. DR's 9's,11's, 12's, 13's, 14.
Both the 5.1 and the Atmos have a foundation of 4.0. You might see some non existent movement in the center channel, but let's just call it 4.0.
The 4.0 bed is strong front and right, weak rears. Audience dominant in rears.
The 5.1-really 4.0 Dolby Digital (only from ripping), it's not stereo but it's more than stereo and adds some punch.
The sonic fidelity in all versions is superb.
In Atmos all 4 heights are full blast all the time, that reverb, stereo on top of stereo, whatever you want to call it, is great.
The ATMOS brought me to a "this is fantastic" not for Prog Rock/Techno Atmos with objects and discrete different speaker moves,
but for shear power. I don't know if your rig is equal to my Hot Rod but this is why I put the time and effort building mine, power.
The foundation equal to the 5.1 rip, but the heights, oh man, not discrete but Holy Heck do they bring the power of the recording out, big time.
One item I feel like I heard for the first time was Dio, just giving it his all with vocal vengeance, very cool. Another you can hear pretty good the audience in the rears at times even when the music is playing.
Turn up that drum solo in War Pigs, cool man.
Give ATMOS a chance. If you listened to this Atmos, and your not, I only like Atmos that is different parts, different speakers, give this another chance, relax and turn it up and just listen to how well your little hot rod drives.
So, for me listening to years of stereo, this new Atmos Rhino Black Sabbath is where it's at man.
Please keep polls pure to your listening experience only.